M4 db level? - Page 2 - SV650.org

Bunkle · 01-09-13, 07:36 PM

Just in case anyone is still interested, with this baffle fitted http://www.ebay.co.uk/itm/EXHAUST-BA...item25816e61a9 my M4 system at 7k was 102db at Snetterton.

24-09-13, 10:50 AM

I got 98 at snetterton with no baffle, and 96 at brands hatch, 5.5k revs.

Why did you do 7k revs?

Bunkle · 24-09-13, 12:40 PM

That what I was told to do. I've since checked the rpm test level for a 2 cylinder 650 and it should've been tested at 5.5k.
They asked me what cc it was, so I guess they presumed it was a 4 cylinder and had no idea what make or model it was (a 4 cylinder 600cc is tested at 7k).
I reckon at 5.5k it would be similar to your readings. I'll know for next time.........

24-03-14, 03:19 PM

I am selling my full m4 carbon system now. It's in the sales section.

Sent from my Nexus 4 using Tapatalk

CB500Racer · 12-08-14, 04:46 PM

I run a full M4 system on my minitwin. It tests at 96db at 5.5k revs Make sure its fully warmed up first as a cold bike will be louder.

John

13-08-14, 08:12 AM

Hhaha, I was told the exact opposit - that it would be louder warm.. What's the reasoning behind the argument?

CB500Racer · 19-10-14, 05:44 PM

everything has in the engine has had chance to expand etc reducing engine sound, mine cold/ish was 99db at oulton park wirral 100 meeting. fully warmed up it was 96db. try it.

John

01-09-13, 07:36 PM	#11
Bunkle Member Join Date: Aug 2012 Location: Linslade, Beds Posts: 405	Re: M4 db level? Just in case anyone is still interested, with this baffle fitted http://www.ebay.co.uk/itm/EXHAUST-BA...item25816e61a9 my M4 system at 7k was 102db at Snetterton.

24-09-13, 10:50 AM	#12
Vinc Guest Posts: n/a	Re: M4 db level? I got 98 at snetterton with no baffle, and 96 at brands hatch, 5.5k revs. Why did you do 7k revs?

24-09-13, 12:40 PM	#13
Bunkle Member Join Date: Aug 2012 Location: Linslade, Beds Posts: 405	Re: M4 db level? That what I was told to do. I've since checked the rpm test level for a 2 cylinder 650 and it should've been tested at 5.5k. They asked me what cc it was, so I guess they presumed it was a 4 cylinder and had no idea what make or model it was (a 4 cylinder 600cc is tested at 7k). I reckon at 5.5k it would be similar to your readings. I'll know for next time.........

24-03-14, 03:19 PM	#14
Vinc Guest Posts: n/a	Re: M4 db level? I am selling my full m4 carbon system now. It's in the sales section. Sent from my Nexus 4 using Tapatalk

12-08-14, 04:46 PM	#15
CB500Racer Member Join Date: Oct 2011 Posts: 53	Re: M4 db level? I run a full M4 system on my minitwin. It tests at 96db at 5.5k revs Make sure its fully warmed up first as a cold bike will be louder. John

13-08-14, 08:12 AM	#16
Vinc Guest Posts: n/a	Re: M4 db level? Hhaha, I was told the exact opposit - that it would be louder warm.. What's the reasoning behind the argument?

19-10-14, 05:44 PM	#17
CB500Racer Member Join Date: Oct 2011 Posts: 53	Re: M4 db level? everything has in the engine has had chance to expand etc reducing engine sound, mine cold/ish was 99db at oulton park wirral 100 meeting. fully warmed up it was 96db. try it. John

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